Jiaqi Zhao,Zheng Fu,Kejie Li,Mengmeng Dai,Zhiying Wang,Guiying Liang,Yanling Wei,Zuoling Fu
The growing demand for efficient and sustainable photonic materials has spurred significant interest in eco-friendly lead-free double perovskites, which exhibit exceptional photoluminescence properties for next-generation sensing and display technologies. However, the emission performance of the material is limited by multiphonon relaxation, which leads to low energy efficiency under complex operating conditions. In this study, the 3H5 energy level of Tm3+ is strategically engineered as an energy bridge within lead-free double perovskites, effectively overcoming the constraints imposed by inefficient multiphonon relaxation in Er3+ (4I11/2 → 4I13/2). This targeted modulation of energy transfer pathways results in a significant 50-fold enhancement in the red-to-green (R/G) emission ratio of Er3+, increasing from 0.09 to 4.58, accompanied by a pronounced chromaticity shift from green (0.278, 0.709) to red (0.678, 0.320). This tunable emission behavior is further modulated by laser power density and excitation wavelength (808 or 980 nm). Moreover, Gd2MgTiO6 (GMTO):Er3+,Tm3+ demonstrates excellent temperature-measuring ability based on the luminescence intensity ratio (2H11/2/4F9/2 → 4I15/2), achieving a maximum relative sensitivity of 1.03% K−1 at 313 K. This work not only demonstrates a generalizable strategy to suppress multiphonon relaxation via lanthanide energy bridges but also paves the way for multifunctional photonic devices tailored to emerging applications in smart sensing, secure communication, and next-generation optoelectronics.
The high-performance detection of hypochlorous acid (HClO) is crucial for life and environmental health, but still challenging for the single fluorescence signal and single sensing channel of probes. Organic cage with strong adsorption ability and cage structure-related fluorescence property, is a type of potential fluorescent probe. However, the single signal and short emission of organic cage hinders its sensing performance. The design of dual emitting organic cage with long wavelength for dual-channel ratiometric sensing of HClO is of great significance. Herein, we reported an organic cage (ROX) as a probe for accurate quantification of HClO. The prepared ROX exhibited capsule topology-facilitated red/green dual emission around 660/502 nm. The cage-like structure was disrupted by the rapid specific redox interaction between imine bond in ROX and HClO. As a result, the fluorescence at 660 nm quenched in conjunction with the enhancement at 502 nm in PBS (pH 4). Besides, the fluorescence increased at 582 nm with constant emission at 480 nm in DMSO/PBS (pH 7) ( V / V , 9/1). The ratio signal in PBS and DMSO/PBS respectively gave the linearity range of 1–30 and 20–45 μM, the limit of detection (3 s ) of 14 and 49 nM, and the relative standard deviation of 1.04 % and 0.54 % for 10 replicate determinations. Based on the mutual validation of dual ratio, the dual-channel ratiometric sensing possesses good accuracy, sensitivity, selectivity, and precision. Moreover, ROX can be applied to HClO monitoring in actual water and disinfectant samples with the recoveries of spiked HClO ranged from 95.0 % to 104.2 %. The proposed sensing method highlights the great potential of organic cage in fluorescence sensing.
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